Tomáš Chvátal has reported problems with memory leaks in the development version of chromium (development versions currently are 19.0.1084.x).
Tomáš suggests staying with the stable version of Chromium (as marked by the Gentoo portage tree, currently versions18.0.1025.x). If possible, I'd like to wait for 19.0.x.x to go stable to avoid downgrading. Let me know if anybody has any issues with staying with the stable version after that. I've bumped the 19.0.1084.x release in the Sabayon overlay in hopes of addressing the current problems with memory leaks. Let me know if this fixes the issues with memory leaks, or if it is still advisable to downgrade to stable.